Mindmajix as a team has got enough questions from the trainees who got their Neo4j Training and cracked interviews at various MNCs around the world and successfully placed.
From the collection of Neo4j Interview questions and Answers, the following are the most common questions we got are listed to make it easy for those who are willing to crack the interview with ease. All the answers to those were written by our professional experienced trainers and are tailored to meet the concepts expected by the interviewer.
|If you want to enrich your career and become a professional in Neo4J, then enroll in "Neo4J Training" - This course will help you to achieve excellence in this domain.|
It is an open-source graph database used to connect rich data to get connected using graph-powered systems in order to deliver accurate connectedness of available data. NoSQL is used to get data connected, with Java and scala implementation.
While working with huge distributed databases.
Following are few important features:
Cypher Query Language - CQL is used to execute queries for Neo4J.
There are two types of query languages - Procedural and declarative.CQL is a Declarative Language.
CQL is the language used in Neo4J and is inspired by SQL to explain graphs to understand easily. Commands like select, insert, update or delete helps one to mention graphs. We execute commands in “$” prompt environment.
Image source: https://neo4j.com/developer/cypher-query-language/
Matching patterns is easy while working with nodes using Neo4J.
Example: To get cast of actors starting with S
MATCH (actor:Person)-[:ACTED_IN]->(movie:Movie) WHERE movie.title STARTS WITH "S" RETURN movie.title AS title, collect(actor.name) AS cast ORDER BY title ASC LIMIT 10;
Other available graph databases in the market are:
There are many commands in Neo4J, of which the following are few basic commands:
To remove labels and properties of the nodes, we use REMOVE.
The main difference is that REMOVE is for labels and properties of nodes, whereas DELETE is to remove nodes and relationships.
In order to improve the performance of the graph traversals, Object Cache is used to cache the nodes and their properties.
There are two types of Object Cache which can also be referred to as High-Level Cache:
SET is the command used to update or add properties to existing relationships.
|A primary database model is Graph DBMS.||A primary database model is Document Store.|
|Implemented in Java and Scala.||Implemented in C++ Language.|
|Neo4j has an optional schema.||MongoDB is schema-free.|
|It uses Cypher query language, Java API, Neo4j-OGM, Spring Data Neo4j, TinkerPop 3||Proprietary protocol using JSON|
|Uses triggers||No triggers are used|
For filtering or limiting the number of rows that return by a query, we use the Neo4j CQL LIMIT clause.
IN Operator Syntax: IN[ ]
CREATE UNIQUE used for fixing the graph structures.
To handle graphs Neo4j is the fastest one compared to MYSQL.
REST architecture, that allows neo4j for remote servers.
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